9991938133 has 8 divisors (see below), whose sum is σ = 10205576640. Its totient is φ = 9780324960.

The previous prime is 9991938119. The next prime is 9991938179. The reversal of 9991938133 is 3318391999.

9991938133 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9991938133 - 2⁹ = 9991937621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991938533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 496360 + ... + 516097.

It is an arithmetic number, because the mean of its divisors is an integer number (1275697080).

Almost surely, 2^9991938133 is an apocalyptic number.

It is an amenable number.

9991938133 is a deficient number, since it is larger than the sum of its proper divisors (213638507).

9991938133 is a wasteful number, since it uses less digits than its factorization.

9991938133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012667.

The product of its digits is 1417176, while the sum is 55.

The square root of 9991938133 is about 99959.6825375111. The cubic root of 9991938133 is about 2153.8555755148.

The spelling of 9991938133 in words is "nine billion, nine hundred ninety-one million, nine hundred thirty-eight thousand, one hundred thirty-three".